Internet privacy involves the right or mandate of personal privacy concerning the storing, repurposing, provision to third parties, and displaying of information pertaining to oneself via the Internet. Privacy can entail either "personally identifiable information" (PII) or non-PII information such as a visitor's behavior on a website. PII refers to any information that can be used to identify an individual. For example, age and physical address alone could identify who an individual is without explicitly disclosing their name, as these two factors are unique enough to typically identify a specific person. A user's digital footprint occurs when either data is collected without the user knowing or when personal data is released deliberately by a user for the purpose of sharing information about oneself by means of websites or social media.